Coefficients are the numbers placed before the reactants in a chemical equation so that the number of atoms in the products on the right side of the equation are equal to the number of atoms in the reactants on the left side. If a written chemical reaction were not balanced in this manner, there would be no information available regarding the relationship between the reactants and products. Also known as stoichiometric coefficients, these numerical values demonstrate that the number of atoms on either side of the equation are equal to each other.
Know MoreThe need for balanced chemical equations is dictated by the law of conservation of mass. The law states that the quantity of each element involved in a chemical reaction does not change. For example, this is an unbalanced equation: N_{2} + O_{2} —> NO. The nitrogen atoms and oxygen atoms on the left-hand reactant side of the equation do not equal the number of atoms on the right-hand product side. Placing a coefficient of 2 before the product, however, will balance out the equation and is written as N_{2} + O_{2} —> 2NO.
In another example, once again involving atoms of nitrogen and oxygen, coefficients need to be added to both sides of the following unbalanced equation: N_{2} + O_{2} —> N_{2}O_{3}. In its unbalanced state, the equation does not show an equal number of nitrogen and oxygen atoms on both the left and right sides. There are two atoms each of nitrogen and oxygen on the left-hand reactant side, but the product side contains two nitrogen atoms and three oxygen atoms. This unbalanced equation violates the law of conservation of mass, but can be remedied by the proper placement of stoichiometric coefficients so that 2N_{2} + 3O_{2} —> 2N_{2}O_{3}. In its balanced form, the equation now shows four nitrogen and six oxygen atoms on both sides of the equation.
Learn more about ChemistryThe chemical equation to describe the creation of zinc(II) sulfide can be written as Zn^{2+} + S^{2-} → ZnS. Zn^{2+} represents a zinc ion with a charge of +2. S^{2−} represents an ion of sulfur that carries a charge of -2.
Full Answer >Substances on the left side of a chemical equation are called reactants. Substances that are found on the right side are referred to as products. In a chemical reaction, the reactants are used up and converted into products.
Full Answer >First, rearrange the variables so that the y term is on the left side of the equal sign and the remaining terms are on the right side of the equal sign. Next, simplify the equation so the y term is in its simplest terms. Once the y term is in its simplest form, the equation is in slope-intercept form.
Full Answer >The molecular weight of copper is 63.546 multiplied by the number of atoms present in the sample. Copper is an element rather than a compound, so the correct metric to describe its weight is either its atomic weight or its molar weight.
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